Lathe-chuck



W. W. LEB.

LATHE GHUGK.

No. 277,908. Pa nted May 22,1883.

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l UNITED d STATES PATENT OFFICE.

WILLIAM w. LEE, or NoErHAMProN, MASSACHUSETTS.

- LANE-CHUCK.

sPEcIFmATIoN forming part or :Letters Patent No. 277,908, dated May aa, 1883.

- Application sied January 3,1883. (No model.)

To all lwhom t may concern:

Be it known that I, WILLIAM W. LEE, of Northampton, in the county of Hampshire and State of Massachusetts, have invented certain new and useful Improvement-s in Chucks for Lathes, of which the following is a specification. My invention relates to improvements in lathe-chucks; and it consists, mainly, ina bar carrying the jaws of the chuckand having a screw-threaded socket at its middle, by which it is screwed directly upon the lathe-spindle. Other features vof my invention relate to the means for operating and adjusting the jaws, and to certain details of construction, all fully described below.

` In the accompanying drawings, which'illustrate a lathe-chuck with all myimprovements as embodied in the best way now known to me, Figure l is a side elevation; Fig.2,a front elevation, and Fig. 3 an end view.

My improved chuck consists of a bar, C C, having a screw-threaded socket, J, at its middle and carrying the jaws A A. The screw on the endof the lathe-spindle enters the socket J, and the chuck is thereby held firmly directly upon the spindle without the intervention of the hub or disk usually used with other chucks. Proper means must ot' course be used for causing the jaws toact as clamps; `and the other features of my invention relate mainly to such means. i A c The jaws A may evidently be connected with the bar C, so as to slide thereon in various ways without departing from Amy invention; but I prefer the arrangement shown in the drawings, as it is the strongest and best. Each jaw A has a hole through its base B, made to tit the bar O.- Lugs F and G- are fast to the bases B B ot' the jaws A A, and also have holes through them. The holes through the lugs F receive the screw-threaded rod D, and the lugs Gr are made to fit the rod E. The jaws are actuated by the rod D, which passes through the holes in the lugs F, which are provided with interior bushings, j, accurately fitted and secured by the pins c.` These bushings j are' threaded, one right and the other left handed,

to receive the threads on the rod D, and are readily removed when worn. This rod D passes against the endsvof the sleeve H, and are held i 4o, adjusted by means of the screws p, which are retained in position by the set-nuts o, are provided to maintain a proper it between holes in the lugs G andthe rod E. Extrajaws adapted to clutch certain articles to be turned may be secured to the jaws A by means ot' the screw-bolts e. The side rod, E, lwhich serves to steady the jaws, is more especially adapted for high speeds, and is therefore properly proportion'ed to counterbalance the right and left threaded rod D. The chuck is secured to the spindle by means of the screw-threaded socket- J, which is also provided with an opening, i, by means of which and a hollow spindle a rod of considerable length may be worked in the lathe. The endsfand g of the rod D are properly shaped to receive a wrench or the like for turning the rod.A The bar C is made as light as possible by being hollowed at the ends h.

In operation, for round turning, the jaws are accurately adjusted equidistant from the axis of the socket J by means ot' the nuts a on the middle part of the right and left threaded rod D. The article to be turned is secured and centered by being clamped between the jaws A. The article is released by turning rod I) in a direction to cause the jaws to recede from each other. Y

By changing the positions of the nuts a a the jaws can be set in any desired relation to the axis of the lathe-spindle, so as to adapt the chuck. for either round or eccentric turning. The nuts next to the sleeve H are adjusted so as not to bear hard against the sleeve, but just enough to prevent the screw-threaded rod D fromh moving endwise. The lock-nuts are then screwed up hard against these nuts, thereby preventing them from turning and bindingagainst the sleeve I-I; Instead of locknuts, set-screws may be inserted in the nuts next to the sleeve.

I claim as my inventionl. The combination ofjaws A A, and means, substantially such as is described, for operat- IOO ing them, with bar C, having a threaded socket, J, adapted to receive the screw end of the lathe-spindle, substantially as described.

2. In a lathe-chuck, the combination of bar G,jaws A A, guided by and moving ou the bar C, rod D, provided with right. and left threads and screwing into nuts secured to the jaws, sleeve H, secured to bar C and through whichV rod D passes, and means, such as described, for adjusting the rod D in relation to the sleeve H, substantially as described.

3. In combination, bar C, jaws A A, sliding thereon,right and left threaded rod D, and rod E, serving both to steady the jaws and counterbalance the screw-threaded rod, substan tally as set forth.

4. The right and left screw-,threaded rod D, having the intermediate screw-threads for the nuts a, in combination with sleeve H, carried by the bar C, and nuts a, by means of which 2o the rod may be adjusted, substantially as set forth.

5. In combination, the bar C, rod D,jaws A A, provided with lugs G G, rod E, passing through the lugs G G and secured to the bar 25 (l, gibs o, and set-screws 19, substantially as and for the purposes set forth.

6. In a 1athe-chuck,the bar O,provided with a screw-threaded socket, J, by means of which it may be secured directly to the lathe-spindle, 5o as set forth.

WiLLIAM vv. LEE.

Witnesses:

W. A. COPELAND, G. B. MAYNADIER. 

